Networks(2) - CG
- Created by: cgribben99
- Created on: 01-03-18 14:02
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- Network Topologies - way in which networks are connected together (not how they communicate)
- Bus/Ethernet Network
- single back bone cable is linked to by all terminals. Commun. are sent in data packets along the backbone. Each machine reads header of data packet to see if it is for that machine
- Advantages
- Cheap
- If one fails others are unaffected
- Fine for light traffic
- Disadvantage
- Backbone breaks = failure
- High traffic= lots of data collision= failure
- Data goes to every terminal= potentially unsecure
- Advantages
- single back bone cable is linked to by all terminals. Commun. are sent in data packets along the backbone. Each machine reads header of data packet to see if it is for that machine
- Ring Network
- One computer makes a token which is passed along the ring, one machine at a time. If machine wants to send message it attaches it to token. Token read by receiving machine.
- Advantages
- All have same access so no one computer hogs network
- Higher transmission speeds as data flows in one direction only
- No collisions
- Disadvantage
- Faults are difficult to locate
- Impossible to keep network running when equipment is added or removed because only one path
- Break in cable and network wont work
- Advantages
- One computer makes a token which is passed along the ring, one machine at a time. If machine wants to send message it attaches it to token. Token read by receiving machine.
- Star Network
- All terminals/ peripherals are connected directly to a central node (switch). Sometimes a server.
- Advantages
- Fault tolerant- if one cable fails, the others can still be used
- Load tolerant- extra computers can be added without much loss in performance because all have own path to server
- Easy to add extra computers without disturbing network
- Advantages
- This continually checks each machine to see if it wants to send data. It forwards commun. directly to receiving computer
- Disadvantage
- Dependent on central server
- Higher cost - large amount of cabling needed
- Disadvantage
- All terminals/ peripherals are connected directly to a central node (switch). Sometimes a server.
- Wireless Network
- Advantages
- Allows inexpensive LAN to be set up without cables
- Freedom of working anywhere decent signal is received
- ideal for old listed buildings where cabling cannot be installed - old buildings
- tidier desk top with no cables - health and safety
- Disadvantage
- Power consumption is high - laptops soon exhaust
- security problems even when encryption is used
- Limited range
- Transmission speed is lower
- Advantages
- Bus/Ethernet Network
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